Hello, I'm sorry that I am unable to help you. Oral cancers are a terrible disease.
I hope someone comes along soon who can advise you specifically.
Have you checked out the main OCF pages as I think Oral Melanomas as a cause are mentioned there.
How is your Mother being treated? Is she being seen at a Comprehensive Cancer Center - a CCC?
I would think that her treatment would be the same as many others on this site though Squamous Cell carcinoma is the primary causative agent for most.
Keep in touch.
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!